Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/088—Removal of water or carbon dioxide from the reaction mixture or reaction components
  • C08G18/0885—Removal of water or carbon dioxide from the reaction mixture or reaction components using additives, e.g. absorbing agents
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
  • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/6614—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38
  • C08G18/6618—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/08—Polyurethanes from polyethers

Definitions

• This invention relates to improved, substantially solvent-free polyurethane reactive systems which can be used in doctor coating processes and which have a long pot-life, which systems are suitable for the coating of fabrics or other substrates.
• a process for coating fabric tubes is known from German Auslegeschrift No. 1,504,690, in which polymeric solutions are initially doctored onto the fabric in a thin layer and the coatings are subsequently dried by heating the tube.
• This process does, however, have two serious disadvantages.
• the tube has to be heated from the inside in order to impart a bubble-free surface to the fabric coating and this means an additional outlay on apparatus.
• the presence of solvents makes processing more difficult since numerous measures have to be taken to suck off the solvent vapors, and processing plants which are protected from explosion are needed.
• a process for coating fabric tubes with solvent-free systems (application of a polymer melt) is described in German Pat. No. 1,778,877.
• a disadvantage of this process is the high temperatures of about 200° C. needed for processing thermoplastic materials.
• the melt bath, pipe work and stripping apparatus have to be kept at this high temperature level.
• the deeper penetration of the plastic coating into the fabric induced by the process causes marked stiffening of the material so that the finished tube becomes more difficult to handle.
• Solvent-free reactive polyurethane compositions for coating fabrics which are stable in storage, are described in German Offenlegungsschrift No. 1,570,48 and U.S. Pat. No. 3,475,200 and are composed of polyhydroxyl compounds, uretdione diisocyanates which melt above 100° C. and chain extenders which melt above 80° C.
• coating pastes of this type are stable in storage over relatively long periods of time, they need uneconomically long reaction times (for example, 90 minutes at 110° C.) in order to cure completely.
• the object of the invention is therefore to avoid the disadvantages described above of the known processes for coating fabrics--presence of solvent; too short pot-life; high processing temperatures and long curing times and simultaneously to allow simple and problem-free handling of the coating compositons.
• the present invention relates to substantially solvent-free coating compositions which can be doctor-coated, comprising
• component (B) represents a prepolymer, containing hydroxyl groups, prepared from
• component (a) wherein the equivalent ratio of component (a) to components (b) to (e) lies between about 0.25 and 0.65, preferably between about 0.35 and 0.60 particularly preferably between about 0.50 and 0.55, and wherein component (B) contains (f) about 1 to 4% by weight of a molecular sieve of the sodium aluminum silicate type and
• Components A) and B) are preferably used in such proportions that the NCO/OH equivalent ratio including any masked NCO groups, which may be contained in component A) lies between about 0.9:1 and 1.5:1, particularly preferably between about 1.0:1 and 1.1:1.
• the coating systems according to the invention have a very long pot-life and a relatively short curing time.
• polyester polyol c) is preferred according to the invention, since the viscosity of the paste would otherwise increase 24 hours after stirring in the solid diisocyanate (A) to such an extent that it would be extremely difficult or even impossible to process the mixture (Example 6).
• polyester polyol (c) does not however need to be chemically incorporated into the hydroxyl group containing prepolymer (B); it can also be added to the mixture of (A) and (B) as a third component.
• any polyisocyanates known per se preferably diisocyanates having a melting point above 100° C., preferably between 125° and 200° C., are suitable as component (A) of the coating compositions according to the invention.
• suitable polyisocyanates include 1,4-dichloro-2,5-diisocyanato-benzene; 1-chloro-4-methoxy-2,5-diisocyanato-benzene; 1,3-dimethoxy-4,6-diisocyanato-benzene; 3,3'-dimethoxy-4,4'-diisocyanato biphenyl; 2,5,2',5'-tetramethyl-4,4'-diisocyanatodiphenyl methane; diphenyl sulphone 4,4'-diisocyanate; naphthylene-1,5-diisocyanate and the urea diisocyanate from 1 mol water and 2 mol 2,4-toluylene
• Diisocyanates containing one uretdione group, of the type formed by dimerization known per se of the polyisocyanates known in polyurethane chemistry are preferred according to the invention because they are solid polyisocyanates having a high melting point.
• Dimeric 2,4-toluylene diisocyanate is particularly preferred.
• All polyisocyanates known per se are in principle suitable for use as isocyanate component a) in the production of the OH-prepolymer (component B) of the reactive systems according to the invention.
• These include aliphatic, cycloaliphatic, araliphatic, aromatic and heterocyclic polyisocyanates of the types described, for example, by W. Siefken in Justus Liebigs Annalen der Chemie, 562, pages 75 to 136, for example those corresponding to the formula
• n 2 to 4, preferably 2, and
• Q represents an aliphatic hydrocarbon radical containing 2 to 18, preferably 6 to 10 carbon atoms; a cycloaliphatic hydrocarbon radical containing 4 to 15, preferably 5 to 10 carbon atoms;
• an aromatic hydrocarbon radical containing 6 to 15 preferably 5 to 13 carbon atoms or an araliphatic hydrocarbon radical containing 8 to 15, preferably 8 to 13 carbon atoms for example, ethylene diisocyanate; 1,4-tetramethylene diisocyanate; 1,6-hexamethylene diisocyanate; 1,12dodecane diisocyanate; cyclobutane-1,3-diisocyanate; cyclohexane-1,3- and 1,4-diisocyanate and mixtures of these isomers; 1-isocyanato-3,3,5-trimethyl-5-isocyanato methylcyclohexane (German Auslegeschrift No. 1,202,785 and U.S. Pat. No.
• 2,4- and 2,6-hexahydrotoluylenediisocyanate and mixtures of these isomers 2,4- and 2,6-hexahydrotoluylenediisocyanate and mixtures of these isomers, hexahydro-1,3- and/or -1,4-phenylene diisocyanate, perhydro-2,4'- and/or -4,4'-diphenyl methane diisocyanate; 1,3- and 1,4-phenylene diisocyanate; 2,4- and 2,6-toluylene diisocyanate and mixtures of these isomers; diphenyl methane 2,4'- and/or -4,4'-diisocyanate and naphthylene-1,5-diisocyanate.
• suitable materials according to the invention include, for example: triphenylmethane-4,4',4"-triisocyanate; polyphenyl:polymethylene polyisocyanates of the type which can be obtained by aniline-formaldehyde condensation and subsequent phosgenation and which are described, for example, in British Pat. Nos. 874,430 and 848,671; m- and p-isocyanatophenylsulphonyl isocyanates according to U.S. Pat. No. 3,454,606 incorporated herein by reference; perchlorinated aryl polyisocyanates of the type described for example, in German Auslegeschrift No. 1,157,601 (U.S. Pat. No.
• distillation residues produced during the commerical production of isocyanate and containing isocyanate groups which may be dissolved in one or more of the above-mentioned polyisocyanates.
• mixtures of the abovementioned polyisocyanates it is possible to use mixtures of the abovementioned polyisocyanates.
• polyisocyanates which are easy to obtain commercially are generally preferred, for example, 2,4- and 2,6-toluylene diisocyanate as well as mixtures of these isomers (“TDI”), polyphenyl-polymethylene polyisocyanates, of the type produced by aniline formaldehyde condensation and subsequent phosgenation (“crude MDI”) and polyisocyanates containing carbodiimide groups, urethane groups, allophanate groups, isocyanurate groups, urea groups or biuret groups (“modified polyisocyanates”), in particular those modified polyisocyanates which are derived from 2,4- and/or 2,6-toluylene diisocyanates or from 4,4'- and/or 2,4'-diphenyl methane diisocyanate.
• TDI 2,4- and 2,6-toluylene diisocyanate
• CAMDI aniline formaldehyde condensation and subsequent phosgenation
• modified polyisocyanates
• the isomeric toluylene diisocyanates are particularly preferred.
• Partially branched polyether polyols are used as component b) with the structure of the hydroxyl prepolymer B), these partially branched polyether polyols preferably having an average hydroxyl functionality of from about 2.5 to 3.0 and an average molecular weight (Mn) of from about 2000 to 4000, particularly preferably about 3500.
• polyethers containing hydroxyl groups are those of the type known per se and are produced, for example, by the polymerization of epoxides such as ethylene oxides, propylene oxide, butylene oxide, tetrahydrofuran, styrene oxide or epichlorohydrin with themselves, for example, in the presence of Lewis catalysts such as boron trifluoride or by the addition of these epoxides, preferably of propylene oxide, either as a mixture or successively, to starting components containing reactive hydrogen atoms such as water, alcohols, ammonia or amines, for example, ethylene glycol, propylene glycol-(1,3) or -(1,2), trimethylol propane, glycerol, sorbitol 4,4'-dihydroxydiphenylpropane, aniline, ethanol amine or ethylene diamine.
• epoxides such as ethylene oxides, propylene oxide, butylene oxide, tetrahydrofur
• Polyethers started on formitol or formose can also be used according to the invention.
• the polyesters containing hydroxyl groups which can be used as components (c) in the structure of the hydroxyl prepolymer include, for example, reaction products of polyhydric, preferably dihydric, optionally additionally trihydric alcohols with polyvalent, preferably divalent carboxylic acids.
• the corresponding carboxylic acid anhydrides or corresponding polycarboxylic acid esters of lower alcohols or their mixtures can be used instead of free polycarboxylic acids, to produce the polyesters.
• the polycarboxylic acids can be aliphatic, cycloaliphatic, aromatic and/or heterocyclic and may be substituted, for example by halogen atoms and/or be unsaturated.
• carboxylic acids and derivatives thereof examples include:
• monomeric unsaturated fatty acids such as oleic acid, terephthalic acid dimethyl ester and terephthalic acid bis-glycol ester.
• Suitable polyhydric alcohols include, for example, ethylene glycol, propylene glycol-(1,2) and -(1,3), butylene glycol-(1,4) and -(2,3), hexane diol-(1,6), octane diol-(1,8), neopentyl glycol, 1,4-bis-hydroxy methyl cyclohexane, 2-methyl-1,3-propane diol, glycerol, trimethylol propane, hexane triol-(1,2,6), butane triol-(1,2,4), trimethylol ethane, pentaerylthrol, quinitol, mannitol and sorbitol, formitol, methyl glycoside, also diethylene glycol, triethylene glycol, tetraethylene glycol and higher polyethylene glycols, dipropylene glycol and higher polypropylene glycols as well as dibutylene glycol and higher polybutylene glycol
• Polyesters of adipic acid and ethylene glycol, propylene glycol or butane diol, in particular polypropylene glycol adipates are preferred.
• Castor oil can also be used as polyester component (c).
• Glycols d) of lower molecular weight which are suitable for the production of the prepolymer component B) include, for example: ethylene glycoll propylene glycol(1,2) and -(1,3), butylene glycol-(1,4) and -(2,3), pentane diol-(1,5), hexane diol-(1,6), octane diol-(1,8), neopentyl glycol, 1,4-bis-hydroxy methyl cyclohexane, 2-methyl-1,3-propane diol, dibromobutene diol; diethylene glycol, triethylene glycol, tetraethylene glycol, higher polyethylene glycols having a molecular weight of up to about 250, dipropylene glycol, higher polypropylene glycols having a molecular weight of up to about 250, dibutylene glycol, 4,4'-dihydroxy diphenyl propane, di-hydroxy methyl-hydroquinone,
• Ester diols corresponding to the following general formulae are other lower molecular diols which are suitable according to the invention and have a molecular weight of up to about 250:
• R represents an alkylene radical containing 1 to 10 preferably 2 to 6 carbon atoms or a cycloalkylene or arylene radical with 6 to 10 carbon atoms;
• R' represents an alkylene radical containing 2 to 15, preferably 2 to 6 carbon atoms or a cycloalkylene or arylene radical containing 6 to 15 carbon atoms and
• x represents a number between 2 and 6 for example, 1,6-hexamethylene-bis-( ⁇ -hydroxyethylurethane) or 4,4'-diphenylmethane-bis-( ⁇ -hydroxybutylurethane); as well as diol ureas corresponding to the general formula ##STR1## in which R" represents an alkylene radical containing 2 to 15, preferably 2 to 9 carbon atoms or a cycloalkylene or arylene radical containing 6 to 15 carbon atoms,
• R'" represents hydrogen or a methyl group
• x represents the numbers 2 or 3, for example, 4,4'-diphenylmethane-bis-( ⁇ -hydroxyethyl urea) or the compound ##STR2##
• Diols (d) which are preferred according to the invention include diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol and tripropylene glycol. Dipropylene glycol is particularly preferred.
• an amino-functional compound for example, a polyamine (preferably an aromatic diamine), hydrazine or hydrazide is also used during the production of the OH-prepolymer.
• Aliphatic diamines which are suitable for use according to the invention include for example, ethylene diamine; 1,4-tetramethylene diamine; 1,11-undecamethylene diamine; 1,12-dodecamethylene diamine and mixtures thereof; 1-amino-3,3,5-trimethyl-5-aminomethyl cyclohexane ("isophorone diamine") 2,4- and 2,6-hexahydrotoluylene diamine and mixtures thereof; perhydro-2,4'- and 4,4'-diaminodiphenyl methane; p-xylylene diamine, bis-(3-aminopropyl)-methyl amine; diaminoperhydroanthrazenes (German Offenlegungsschrift No.
• Hydrazine, and substituted hydrazines for example methyl hydrazine, N,N'-dimethylhydrazine and homologues thereof as well as acid dihydrazides can also be used according to the invention, for example carbodihydrazides; oxalic acid dihydrazide; the dihydrazides of malonic acid; succinic acid; glutaric acid; adipic acid, ⁇ -methyl adipic acid, sebacic acid, hydracrylic acid and terephthalic acid; semicarbazido-alkylene-hydrazides such as, for example, ⁇ -semicarbazido propionic acid hydrazide (German Offenlegungsschrift No.
• aromatic diamines examples include bisanthranilic acid esters according to German Offenlegungsschriften Nos. 2,040,644 and 2,160,590; 3,5- and 2,4-diamino benzoic acid ester according to German Offenlegungsschrift No. 2,025,900; diamines containing ester groups, described in German Offenlegungsschriften Nos. 1,803,635 (U.S. Pat. Nos. 3,681,290 and 3,736,350 both incorporated herein by reference), 2,040,650 and 2,160,589, the diamines containing ether groups according to German Offentechnischsschriften Nos. 1,770,525 and 1,809,172 (U.S. Pat. Nos.
• zeolites which are commercially available as molecular sieves for example, are used according to the invention as sodium aluminum silicates f).
• Suitable activators g) include polyurethane catalysts of the type known per se, for example, tertiary amines, such as triethyl amine; tributyl amine; N-methyl morpholine; N-ethyl morpholine; N,N,N',N'-tetramethyl-ethylene diamine; pentamethyldiethylene triamine and higher homologues (German Offenlegungsschriften Nos.
• tertiary amines such as triethyl amine; tributyl amine; N-methyl morpholine; N-ethyl morpholine; N,N,N',N'-tetramethyl-ethylene diamine; pentamethyldiethylene triamine and higher homologues (German Offenlegungsschriften Nos.
• N,N-dimethylbenzyl amine N,N-dimethylcyclohexyl amine; N,N-diethylbenzyl amine; bis-(N,N-diethylaminoethyl)-adipate; N,N,N',N'-tetramethyl-1,3-butane diamine; N,N-dimethyl- ⁇ -phenyl-ethyl amine, 1,2-dimethyl imidazole, 2-methyl imidazole, monocyclic and bicyclic amidines, (German Offenlegungsschrift No. 1,720,633), bis-(dialkylamino) dialkyl ether (U.S. Pat. No.
• Suitable catalysts include Mannich bases known per se of secondary amines such as dimethyl amine and aldehydes, preferably formaldehyde, or ketones such as acetone, methylethyl ketone or cyclohexanone and phenols such as phenol, nonylphenol or bisphenol.
• Tertiary amines containing hydrogen atoms which are active toward isocyanate groups, as catalysts include for example, triethanol amine, triisopropanol amine, N-methyl-diethanol amine, N-ethyl-diethanol amine, N,N-dimethyl-ethanol amine, the reaction products thereof with alkylene oxides such as propylene oxide and/or ethylene oxide as well as secondary tertiary amines according to German Offenlegungsschrift No. 2,732,292.
• Suitable catalysts also include sila-amines with carbon-silicone bonds of the type described, for example, in German Pat. No. 1,229,290 (corresponding to U.S. Pat. No. 3,620,984 incorporated herein by reference), for example, 2,2,4-trimethyl-2-sila-morpholine and 1,3-diethyl amino methyl-tetramethyl-disiloxane.
• Nitrogen-containing bases such as tetraalkyl ammonium hydroxides, alkali metal hydroxides such as sodium hydroxide, alkali metal phenolates such as sodium phenolate or alkali metal alcoholates such as sodium methylate can also be used as catalysts.
• Hexahydratriazines can also be used as catalysts (German Offenlegungsschrift No. 1,769,043).
• Organometallic compounds in particular organotin compounds can be used as catalysts according to the invention.
• sulphur-containing compounds such as di-n-octyl tin mercaptide (German Auslegeschrift No. 1,769,367; U.S. Pat.
• organo-tin compounds the tin (II) salts of carboxylic acids such as tin (II)acetate, tin(II)-octoate, tin(II)-ethyl hexoate and tin(II)laurate and tin(IV)-compounds, for example dibutyl tin oxide, dibutyl tin dichloride, dibutyl tin diacetates, dibutyl tin dilaurate, dibutyl tin maleate or dioctyl tin diacetate.
• carboxylic acids such as tin (II)acetate, tin(II)-octoate, tin(II)-ethyl hexoate and tin(II)laurate and tin(IV)-compounds, for example dibutyl tin oxide, dibutyl tin dichloride, dibutyl
• catalysts can of course be used as mixtures.
• Combinations of organic metal compounds, in particular metal salts of carboxylic acids (for example the Pb-salt of 2-ethyl hexanic acid) with amine catalysts such as diazabicyclo octane are of particular interest. Catalyst combinations of this type lead to coating compositions having a particularly long pot-life at room temperature but still having a short curing time when heated (for example, three minutes at 100° C.).
• emulsifiers such as emulsifiers can also be used according to the invention.
• Suitable emulsifiers include for example, the sodium salts of castor oil sulphonates or salts of fatty acids with amines such as oleic acid diethyl amine or stearic acid diethanol amine.
• Alkali or ammonium salts of sulphonic acids such as those of dodecyl benzene sulphonic acid or dinaphthyl methane disulphonic acid or of fatty acids such as ricinoleic acid or of polymeric fatty acids can also be used as surface-active additives.
• Reaction retarders can also be used according to the invention, if desired, for example, acid reacting materials such as hydrochloric acid or organic acid halides, as can cell regulators of the type known per se such as paraffins, fatty alcohols or dimethyl polysiloxanes as well as pigments or dyestuffs and flame retardants of the type known per se, for example tris-chloroethyl phosphate, tricresyl phosphate or ammonium phosphate and poly-phosphate. Stabilizers against the influences of ageing and weathering, plasticizers and substances having a fungistatic and bacteriostatic effect as well as fillers such as barium sulphate, kieselguhr, carbon black or whiting can also be used.
• acid reacting materials such as hydrochloric acid or organic acid halides
• cell regulators such as paraffins, fatty alcohols or dimethyl polysiloxanes
• pigments or dyestuffs and flame retardants of the type known per se
• the compounds A) to e) described in detail above are reacted together in a one-shot process at a NCO/(OH+NH)-equivalent ratio of about 0.25:1 to 0.65:1, preferably about 0.35:1 to 0.60:1, particularly preferably about 0.50:1 to 0.55:1.
• the polyester polyol (c) which may be used simultaneously can also be added only to the finished OH prepolymer.
• the components (f) and (g) are preferably also used during the production of the OH prepolymer, but they can also be mixed with the finished OH prepolymer (B) and the solid polyisocyanate (A)--as can other additives which may be used.
• polyurethane reactive systems according to the invention which are stable in storage are suitable for coating a wide variety of substrates.
• fabric tubes can also preferably be coated by means of coating installations known per se.
• the coating composition is applied to the support in the desired thickness of the layer, for example by means of a doctor, brush, roller, or the like.
• the method of application is not subject to any restrictions because of the extremely long pot-life of the systems. There is no risk of the doctor gelling or curing.
• the support material provided with the coating can, for example, be passed through a heating duct, guided over a heating table or drawn through an IR field for the curing process.
• This operation can be performed, for example, at temperatures between about 80° and 180° C., depending upon the thermal load which the substrate to be coated can withstand.
• the setting times of the coating accordingly lie between about 1 and 5 minutes.
• the coating operation can be performed both horizontally and vertically owing to the excellent intrinsic viscosity of the polyurethane systems, without compositions applied running in the heat.
• the paste produced in this way is storage stable for several months at room temperature.
• the storage stability lasts for two weeks at 50° C.
• the mixture sets within 1 to 3 minutes when heated to 100° C.
• the paste can optionally be dyed using suitable color pigments.
• reaction temperature increases to from 80° to 100° C. depending upon the quantity of mixture.
• Example 1 The mixture is subsequently activated as in Example 1. This reactive paste is also stable in storage for months at room temperature, but cures within 1 to 3 minutes at 100° C.
• the resulting paste cures with the same activation after only 10 minutes at 100° C., using the activator mixture described in Example 1. The surface remains tacky.
• a paste is subsequently produced using 18 parts of the dimeric 2,4-toluylene diisocyanate on 100 parts of the prepolymer. After activation using 1% activator mixture according to Example 1, thorough curing is achieved within 20 seconds at 100° C. However, the paste is only stable in storage for about eight hours at room temperature.
• the recipe corresponds to the one according to Example 1, but without the diamine. Shortly after the isocyanate has been stirred in, the urethane rigid segment formed precipitates in granular form. The subsequent processing with dimeric isocyanate does not lead to a homogeneous final product.
• Example 2 is repeated without using the polyester polyol:
• the viscosity of the mixture of hydroxyl-prepolymer and dimeric toluylene diisocyanate increases greatly after only a few hours so that the material can no longer be processed.
• Example 1 is repeated without zeolite.
• Example 1 are mixed homogeneously with 39 parts dimeric toluylene diisocyanate. The mixture is subsequently activated using 1% activator mixture as in Example 1.
• the paste produced sets within two minutes at 110° C. but remains flexible and tacky, in contrast to the polyurethane from Example 1. Although the paste is still of a putty-like consistency after 24 hours storage at room temperature, curing is even less complete at 110° C.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Polyurethanes Or Polyureas (AREA)
• Paints Or Removers (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• General Preparation And Processing Of Foods (AREA)

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Cited By (39)

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Citations (8)

• 1978
  • 1978-09-30 DE DE19782842805 patent/DE2842805A1/de not_active Withdrawn
• 1979
  • 1979-09-11 CA CA335,386A patent/CA1130033A/en not_active Expired
  • 1979-09-13 NO NO792971A patent/NO792971L/no unknown
  • 1979-09-17 AT AT79103466T patent/ATE2010T1/de not_active IP Right Cessation
  • 1979-09-17 DE DE7979103466T patent/DE2964287D1/de not_active Expired
  • 1979-09-17 EP EP79103466A patent/EP0009698B1/de not_active Expired
  • 1979-09-18 US US06/076,703 patent/US4251427A/en not_active Expired - Lifetime
  • 1979-09-27 FI FI793011A patent/FI793011A7/fi not_active Application Discontinuation
  • 1979-09-29 JP JP12480879A patent/JPS5548259A/ja active Pending

Patent Citations (8)

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